package Thread;

import java.util.Scanner;

public class Demo21 {
    private volatile static int flag = 0;

    public static void main(String[] args) {
        Thread t1 = new Thread(() -> {
            while (flag == 0) {

            }
            System.out.println("t1 线程结束");
        });
        Thread t2 = new Thread(() -> {
            // 针对 flag 进行修改
            Scanner scanner = new Scanner(System.in);
            System.out.println("请输入 flag 的值: ");
            flag = scanner.nextInt();
        });
        t1.start();
        t2.start();
    }
}